Treatment for leukodystrophy could be “revolutionary”

Demyelination of neuron

The US Food and Drug Administration (FDA) has granted Rare Paediatric Disease (RPD) Designation to SynaptixBio’s drug candidate for TUBB4a leukodystrophy – a genetic and debilitating condition which mainly affects babies and young children. 

RPDs are designed to encourage the development of new drugs with high unmet medical needs, including rare diseases in children. 

The designation is the first step to gaining a priority review voucher (PRV), which can accelerate market access for therapeutics. They can also be sold or traded by sponsors, such as big pharma corporations. 

In July last year, a PRV was sold by pharma multinational Mallinckrodt to Novartis for £81m ($100 million). 

Launched in 2020, the Oxford-based business hopes the designation will “open regulatory discussions, supplement funding, increase the viability of drug development and enable quick access to market a treatment.”  

SynaptixBio CEO and co-founder Dr Dan Williams said the designation was a “monumental step forward” in its bid to treat the disease. “This is a key part of our overall strategy,” he said. “To be granted an RPD will enable us to accelerate our research into TUBB4a treatments, while ensuring the work being done to tackle it remains a focus within medical communities around the world.  

“Obtaining a PRV will not only validate the rarity and importance of the disease, it will lower the commercial risk for partners and investors, and potentially fund ongoing drug development.” 

A treatment from antisense oligonucleotides

Earlier this year, SynaptixBio entered into a sponsored research agreement with the world-leading leukodystrophy centre the Children’s Hospital of Philadelphia (CHOP) in the US to develop a TUBB4a leukodystrophy treatment from antisense oligonucleotides (ASOs). 

The licence, which includes worldwide exclusive patent rights, allows SynaptixBio to translate CHOP’s research to first-in-human clinical trials, which could launch as early as 2024. 

Dr Adeline Vanderver, who is program director of the Leukodystrophy Center at CHOP and a pre-eminent figure in the research related to TUBB4a, said: “ASOs provide the potential to stabilise, improve quality of life, and extend life expectancy of children suffering from the condition. Successful prevention of leukodystrophy progression would be revolutionary, life-saving, and life-enriching.” 

TUBB4a leukodystrophy makes up 9% of a group of about 30 rare neurodegenerative disorders known as leukodystrophies. Caused by a mutation in the TUBB4A gene, the disease disrupts myelin surrounding nerves, leading to interruption of the signals between nerve cells in the brain.  

At its most severe, the condition can lead to significant impairment of motor skills such as walking, sitting up and even swallowing.   

It is hoped ASOs, which have previously been used to treat conditions such as Duchenne muscular dystrophy and spinal muscular atrophy, will dramatically improve the quality of, and extend, the lives of TUBB4a patients. 

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